Self-drilling type lateral pressure simulation test device and method for stratum containing natural gas hydrate

Abstract

The invention provides a self-drilling type lateral pressure simulation test device and method for a stratum containing a natural gas hydrate, and belongs to the technical field of rock and soil mechanics. The device comprises a reaction kettle, a cutting tool, a mud conveying mechanism and a lateral pressure testing device, wherein the reaction kettle is used for being filled with natural gas hydrate-containing stratum simulation substances to be tested, the cutting tool is arranged in the reaction kettle and can move up and down relative to the reaction kettle, one end of the mud conveying mechanism is communicated with the reaction kettle, themud conveying mechanism is used for outputting mud cut by the cutting tool from the reaction kettle; the lateral pressure testing device can move to a set depth along with the cutting tool to complete a lateral pressure testing experiment. The method is realized based on the device. The in-situ testing method can be used for directly testing the engineering mechanical parameters of the stratum containing the natural gas hydrate, and meanwhile, the in-situ testing method has important significance on stratum stability of natural gas hydrate development and prevention and control of engineering disasters.

Description

technical field [0001] The invention relates to the technical field of rock and soil mechanics, in particular to a self-drilling side pressure simulation test device and method for a formation containing natural gas hydrate. Background technique [0002] Natural gas hydrates are usually distributed in permafrost regions on land or deep-sea shallow sediments at continental margins. Under certain temperature and pressure conditions, methane gas and water combine to form cage compounds. In the past 20 years, although scholars at home and abroad have done a lot of research on gas hydrate-bearing sediments, in terms of seabed hydrate reservoirs, since gas hydrates are in deep-sea environments, they are sensitive to changes in the temperature and pressure of the environment where they occur, and they are easily generated. Decomposition, it is difficult to obtain the original sample, and the test of key physical and mechanical parameters is not accurate. Contents of the invention...

AI Technical Summary

Problems solved by technology

In the past 20 years, although scholars at home and abroad have done a lot of research on gas hydrate-bearing sediments, in terms of seabed hydrate reservoirs, since gas hydrates are in deep-sea environments, they are sensitive to changes in the temperature and pressure of the environment where they occur, and they are easily generated. Decomposition, it is difficult to obtain the original sample, and the test of key physical and mechanical parameters is inaccurate

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